Does $(document).ready() Always Have Access to Final CSS Values?
Dec 01, 2024 am 10:32 AM
Are CSS Values Available When $(document).ready() Executes?
Question:
Why does a script執(zhí)行于$(document).ready on a page with dynamic content alignment sometimes lag or malfunction?
Answer:
According to jQuery's release notes and documentation, $(document).ready() may not wait for CSS values to be fully injected into the DOM. Therefore, it is recommended to include all CSS files in the
before any script references.Explanation:
- Asynchronous CSS Loading: CSS files are loaded asynchronously, meaning JavaScript can execute before CSS rendering is complete.
- CSS Dependency on JS Calculations: In some cases, JavaScript calculations rely on CSS values to determine element dimensions and positioning, which can lead to inaccuracies if CSS values are not yet available.
-
Browser-Specific Behavior: The behavior observed in the asked question may be related to specific browser behaviors, such as:
- Internet Explorer: Sometimes halts JS execution until external CSS is loaded, especially if CSS is placed above JS in the page.
- Other browsers: May not always halt JS execution even if CSS is not fully loaded.
Resolution:
To ensure CSS values are available when $(document).ready() executes:
- Always include CSS files before JavaScript references in the of the HTML document.
- If possible, consider moving the script to the bottom of the page, after all CSS and content has loaded.
Additional Notes:
- In most cases, placing CSS above JS will resolve performance issues related to CSS dependency on JS calculations.
- However, complex browser-specific behaviors related to asynchronous resource loading and script execution may still occur.
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